Me. Rev. Stat. tit. 14, § 1403

Notwithstanding any court rule to the contrary, when, after an event, measures are taken that, if taken previously, would have made the event less likely to occur, evidence of the subsequent measures is not admissible to prove negligence or culpable conduct in connection with the event. This section does not require the exclusion of evidence of subsequent measures when offered for another purpose, such as proving ownership, control or feasibility of precautionary measures, if controverted, or impeachment.